Or well, that was the issue. Recently the game has been immediately booting me back to my login manager once I get in game. I've tried both the steam and non-steam versions of the game and they give me the same problem. I saw a post somewhere where someone had a similar issue, and it was fixed by upgrading LLVM to the 3.6 svn, so I used the llvm-toolchain-svn pkgbuild on the AUR (I can't directly link to it). I figure that it's LLVM 3.6 causing me to boot back to my login manager, because before it was just locking up my GPU. I'm using a R9 280x with radeonsi.
What kernel version you using? The guy who's fixed game by upgrading to LLVM 3.6 also upgraded kernel to latest one as far as I remember.
I would suggest to try something newer when you'll able to. GPU you have is really need as recent kernel/X/Mesa as possible. Though I'll ask another player who have similar problem what kernel he using at moment.